[F:1][CH:2]([F:13])[O:3][C:4]1[CH:9]=[CH:8][C:7]([CH2:10][CH2:11][OH:12])=[CH:6][CH:5]=1.C(N(CC)CC)C.[CH3:21][S:22](Cl)(=[O:24])=[O:23]>C(Cl)Cl>[F:1][CH:2]([F:13])[O:3][C:4]1[CH:5]=[CH:6][C:7]([CH2:10][CH2:11][O:12][S:22]([CH3:21])(=[O:24])=[O:23])=[CH:8][CH:9]=1A solution of 2-(4-difluoromethoxyphenyl)-ethanol (0.582 g, 3.09 mmol, from step (iii) above) in methylene chloride (8 mL) was cooled to 0° C. Triethylamine (0.52 mL, 3.7 mmol) was added followed by a solution of methanesulfonyl chloride (0.26 mL, 3.4 mmol) in methylene chloride (2 mL) and the reaction mixture was stirred at 0° C. for 90 min. The reaction mixture was diluted with methylene chloride (40 mL) and the organic phase was washed with water (2×30 mL) and brine (30 mL), dried over Na2SO4, and concentrated in vacuo to give 0.78 g (95%) of the title compound as a colourless oil.
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